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# Sunni and Shia
- URL: https://www.mohammadsiddiqui.com/sunni-and-shia/
- Published: 2026-09-01T23:58:21.000Z
- Updated: 2026-09-02T02:52:25.000Z
- Description: Origins, anatomy, diffusion. Three long reads that try to explain the divergence without taking a side, and that say plainly where the evidence runs out.
- Author: Mohammad Siddiqui
- Tags: Deen, sunni-and-shia

Theme

A three-part series

Origins, anatomy, diffusion. Three long reads that try to explain the divergence without taking a side, and that say plainly where the evidence runs out.

**Mohammad Siddiqui**, min readThree parts · about 24,000 wordsSources throughout

I

## The three parts

Each stands on its own. Read them in order if you want the argument to build; jump straight to whichever question brought you here if not.

[Part oneHow Sunni and Shia Came to BeThe succession question, the scriptural evidence read by both traditions in their own terms, and the timeline of a divergence that took three centuries to finish.21 verses and hadith, each with both readings · a five-phase timeline · the full branch treeRead it →](https://www.mohammadsiddiqui.com/how-sunni-and-shia-came-to-be/)[Part twoThe House and the SchoolsThe genealogy from the Prophet ﷺ to living claimants, every school broken down by the method it actually uses, and an honest answer to the fidelity question.The Twelve Imams · Sunni and Shia branches in depth · how each school derives lawRead it →](https://www.mohammadsiddiqui.com/the-house-and-the-schools/)[Part threeHow Islam TravelledHow each school reached the countries it holds today. A map of the madhhabs is a map of medieval states, caravan roads and monsoon winds, not of doctrine.Nine engines of diffusion · a filterable route map · region-by-region arrivalsRead it →](https://www.mohammadsiddiqui.com/how-islam-travelled/)

II

## How this is written

Three commitments govern all three parts, and they are worth stating before you start.

#### Both sides in their own terms

Where the traditions read the same verse or hadith differently, both readings are given as their own scholars would state them, and no verdict is appended. Where one tradition rejects a report the other accepts, that is stated rather than smoothed over.

#### Sources labelled by provenance

A report from Ṣaḥīḥ al-Bukhārī is a Sunni canonical source. One from *al-Kāfī* is a Twelver canonical source. A date from al-Ṭabarī is third-century historiography with its own problems. Every hadith carries a collection and number you can check.

#### The limits are marked

Contested dates say so. Figures that circulate widely but are weakly sourced are named as such and not repeated. Where a causal story is modern scholarly inference rather than documented event-history, the text says which it is.

The correction that reorganises everything

### Nobody at the Prophet’s funeral belonged to a sect

What existed in 632 was a political crisis, then a civil war, then a set of unresolved arguments about authority. Only across the following two to three centuries did those arguments harden into two traditions with their own hadith canons, legal systems, theologies and rituals.

**Reading the schism backwards into 632 is the most common error in popular accounts, on every side.** Said plainly, because these pages give both traditions their own terms everywhere else: this historicist framing is itself a frame, not the view from nowhere. Each tradition holds that its own position is what the Prophet left and the other is the departure, and neither concedes the account below.

III

## What is actually counted

One figure to set expectations before you read any percentage anywhere in this series, or anywhere else.

**The top bar is survey data. Everything below it is not, and the figure says so in its own encoding.** Pew measured only the Sunni/Shia split, and gave it deliberately as a range. **That measurement is from 2009 and has never been repeated:** it is the most recent global Sunni/Shia estimate anyone has produced, which is worth knowing before you cite it as current. No census of madhhab affiliation exists in any country at all, so the lower bar is hatched throughout: treat the order as meaningful and the exact widths as not.

↔ Scroll the figure sideways

Cite this page

Siddiqui, M. “Sunni and Shia: origins, anatomy, diffusion.” *mohammadsiddiqui.com*.

Part of a three-part series on the origins, anatomy and diffusion of the Sunni–Shia divergence. *Where a causal story is scholarly inference rather than documented event-history, it is marked as such.*  
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